Interlines



J. P. McDONALD. INTERLINER FOR TIRES. APPLICATION FILED sbrnzo. 191a.

Patterned Oct. 7,1919.

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JOHN 1. MoDONALD -OF, ORANGF, TEXAS.

' INTERLINER r'oit' irmns.

To all whom it may concern:

Be it known that I. JOHN P. MCDONALD,

a. citizen of the United States, residin at Orange, in the county of Orange and tate of Texas, have lnvented a new and useful Interlincr for Tires, of which the following is a specification.

The subject of this invention Is an 1nterliner for tires adapted to be used on pneumatic tires.

The main object of the invention is the provision of an interliner whichwill properly adjust itself to the inner walls of the outer casing.

Another object of the invention is the provision of an interliner which will adjustthe utility of interliners.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understod that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

A practlcal embodiment of the invention is shown in the accompanying drawing, wherein:

Figure 1 is a cross section of a tire equipped with an interliner constructed in accordance with the invention;

Fig. 2 is a plan view of one of the fastening devices;

Fig. 3 is a side elevation of a modified form of fastener;

vation of a further modification of the Fig. 4 isa plan view of the same;

Fig. 5 is a fragmentary view in side elefastener;

Fig. (3 a plan view of the same; Re ferring to the drawing by numerals of reference The usual inner tube} of a pneumatic tire is indicated by thenumeral 1', and the outer I casing by the numeral 2, while the rim gon Specification of Letters Patent.

Patented Oct. 7, 1919.

Application filed September 20, 1918. Serial No. 254,933.

which the tire is secured is indicated by the numeral 3.

Between the inner tube 1 and the outer casing 2 is placed the interliner 4; which forms the subject of the present invention. The interliner 4 is made of any suit-able flexible materiahthe same bein ,'preferably,

l e u D v non-elastic. The lnterllner 4 enclrcles the inner tube and has its longitudinal edges lapping, as at 5.

Smtably spaced along the longitudinal edge of he Inner lap, are tackshavlng large fiat heads 6', from which extend the blunt pointed spurs 6. The spurs 6 extend through the inner lap and for a suitable distance beyond the outer surface thereof, and

are adapted to bepressed into the outer lap of the interliner to bind the lapping portions together and lock the liner against'further expansion. This lockingis caused by the pressure of the inner tube when the same has been-inflated. to a suiiicient extent to properly fill the casing.

In place of the spaced tacks just described,

short plates 7 may be used, fromwhich plates are struck the spaced spurs 8, which are somewhat blunted and which pass through the inner lap of the interliner and are forced 1nto the outer lap, as heretofore described, to lock the interliner against further expansion.

A further modification of the locking means consists in an elongated plate 9, which may extend along the longitudinal edge'ofthe interliner for the complete length of the interliner, and which plate has spurs 10 struck downwardly therefrom for the pur- 1 pose heretofore set forth. I

fIbQ peratiOn is as follows :The interl ner'rs'placed about the inner tube and inserted in the casing. The inner tube is then inflated, the interliner gradually expanding,

until the inner tube has received a proper pressure of air. The pressure 'will then cause the blunt spurs to pierce the outer lap of the interliner and lock the interliner against further expansion. This will provent undue strain on the outer casing, and

will also insure against pinching the inner tube, and thereby injuring the same.

Having thus described the invention, what Patent, is

is claimed as new and sought by Letters An interliner for tires, including a striP In testimony that I claim the foregoing cf flGXlblE materm]. havmg evel'lappmg :15 my own, I have hereto uflixed my slgnaedges, an elongated plate havmg spurs, en-' ture in the presence of two WltllQSSUH.

gaging one edge of the interliner tl'uoughout JOHN P. MCDONALD.

its length sald spurs adapted to extend \Vitnesses: through the overlapping edges, of the in- R. B. GOREE, terliner for holding the same in position. SAM B. GUY. 

